Mechatronic
temperature measurement
Compact temperature switch
Flameproof enclosure Ex d
Model TCA
WIKA data sheet TV 31.65
Process Compact Series
Applications
■■ Temperature monitoring and control of processes
■■ Safety-critical applications in general process instrumen-
tation, especially in the chemical and petrochemical industries, oil and gas industries, power generation incl. nuclear
power plants, water/wastewater industries, mining
■■ For measuring points with limited space, e.g. control
panels
Special features
■■ No power supply needed for switching of electrical loads
■■ Setting ranges from -30 ... +10 °C to 160 ... 250 °C
■■ Repeatability of the set point ≤ 1% span
■■ 1 set point, SPDT or DPDT, high switching power up to
AC 250 V, 15 A
■■ Direct mounting or remote mounting with capillary ≤ 10 m
Fig. left: Remote mounting with capillary
Fig. right: Direct mounting
Description
These high-quality temperature switches have been
developed especially for safety-critical applications. The high
quality of the products and manufacturing in accordance with
ISO 9001 ensure reliable monitoring of your plant. In production, the switches are traced by quality assurance software at
every step and subsequently are 100 % tested.
In order to ensure as flexible operation as possible, the
temperature switches are fitted with micro switches, which
enable the switching of an electrical load of up to AC 250 V,
15 A directly. For lower switching power ratings, such as for
PLC applications, micro switches with gold-plated contacts
can be selected as an option.
WIKA data sheet TV 31.65 ∙ 05/2016
Data sheets showing similar products:
Temperature switch; model TCS; see data sheet TV 31.64
All wetted materials are from stainless steel as a standard.
The measuring system parts and the flexible spiral armour
are made of stainless steel.
The model TCA temperature switch is extremely robust and
guarantees optimal operating characteristics in a limited
space with repeatability lower than 1 % of span.
Page 1 of 6
Standard version
Ignition protection type
■■ Ex d I Mb (mines), only available with stainless steel
switch enclosure
■■ Ex d IIC T6/T4 1) Gb (gas)
■■ Ex tb IIIC T85/T135 1) Db (dust)
Measuring principle
Vapour pressure measuring system (SAMA IIC and IIA)
Switch enclosure
1) The temperature class is related to the ambient temperature range. See the type
examination certificate for further details.
■■ Aluminium alloy, copper-free, epoxy resin coated
■■ Stainless steel 316L
Tamper-proof
Laser-engraved product label from stainless steel
Ingress protection
IP66 per EN/lEC 60529, NEMA 4X
Permissible ambient temperature
-40 ... +85 °C
Switch contact
Micro switches with fixed dead band
■■ 1 x SPDT (single pole double throw)
■■ 1 x DPDT (double pole double throw)
The DPDT function is realised with 2 simultaneously
triggering SPDT micro switches within 2 % of the span
Contact version
A
B
Electrical rating (resistive load)
1 x SPDT, silver
1 x SPDT, silver, hermetically sealed, argon gas filling
AC
DC
250 V, 15 A
24 V, 2 A, 220 V, 0.5 A
250 V, 15 A
2)
24 V, 2 A, 125 V, 0.5 A, 220 V, 0.25 A
C
1 x SPDT, gold-plated, hermetically sealed, argon gas filling
125 V, 1 A
24 V, 0.5 A
1 x DPDT, silver
250 V, 5 A
24 V, 0.5 A
H
1 x DPDT, silver, hermetically sealed, argon gas filling 2)
250 V, 5 A
24 V, 0.5 A
G
2)
2) Permissible ambient temperature range: -30 ... +70 °C
Set point adjustment
The set point can be specified by the customer or factory-set
within the setting range. Subsequent adjustment of the set
point on site is made using the adjustment screw, which is
covered by the access cover plate with lead seal option.
Repeatability of the set point
≤ 1 % of span
Example
Setting range: 40 ... 100 °C with one switch contact
Repeatability: 1 % of 60 °C = 0.6 °C
Dead band = 1.5 °C (see table setting range)
2 x repeatability + dead band = 2 x 0.6 °C + 1.5 °C = 2.7 °C
Rising temperature: Adjust set point between 42.7 ... 100 °C.
Falling temperature: Adjust set point between 40 ... 97.3 °C.
Please specify:
Set point, switching direction for the contact, e.g.:
Set point: 50 °C, rising
After unscrewing the access cover plate, set point adjustment can be made using the adjustment screw. The set point
is selectable within the entire setting range.
For optimal performance we suggest to adjust the set point
between 25 ... 75 % of the setting range.
Page 2 of 6
WIKA data sheet TV 31.65 ∙ 05/2016
Sensor version
■■ Direct mounting
■■ Remote mounting with capillary
Sensor dimensions
Direct mounting
Process connection
SAMA
class1)
Stem ∅ D
in mm
IIC
IIA
9.5
Active
length
X in mm
65
Insertion
length
Y in mm
9.5
55
125 2)
125 2)
1) See table “Setting range” on page 4
2) Other insertion length for direct mounting ≤ 1 m, on request
Remote mounting with capillary
↕
Process connection
Adjustable insertion length Y for remote mounting with
capillary
Due to the flexibility of the spiral armour, the insertion length
(Y) can be adjusted during installation with the sliding
compression fitting. The insertion length is adjustable
between Ymin and Ymax (see table).
Example
Capillary length K: 2 m
Setting range: 40 ... 100 °C (SAMA class IIC)
Stem ∅ D: 9.5 mm
Minimum insertion length Ymin = 100 mm
Maximum insertion length Ymax = 350 mm
Adjustable insertion length Y = 100 ... 350 mm
The capillary length is reduced accordingly.
Maximum capillary reduction
K¯ = Ymax - Ymin = 350 – 100 = 250 mm
Minimum capillary length
Kmin = K - K¯ = 2,000 – 250 = 1,750 mm
Due to the adjustable insertion length (Y) of 100 ... 350 mm,
the resulting capillary length (K) varies between 2.0 ... 1.75 m.
Process connection
Stainless steel compression fitting, sliding on capillary or
stem
■■ ½ NPT male (standard)
■■ ¾ NPT male
■■ G ½ A male
■■ G ¾ A male
WIKA data sheet TV 31.65 ∙ 05/2016
SAMA
class1)
Bulb
Stem
∅D
in mm
IIC
9.5
IIA 3)
9.5
Active
length X
in mm
Insertion
length
in mm
Ymin
Ymax
Capillary
length K
in m
71
100
350
2
84
130
900
5
124
170
1,800
10
55
100
350
2
55
100
900
5
55
100
1,800
10
1) See table “Setting range” on page 4
3) For SAMA IIA ranges the recommended height difference between sensor and case is
≤ 2 m. Otherwise the “bulb elevation error” has to be considered.
Electrical connection
■■ ½ NPT female (standard)
■■ ¾ NPT, M 20 x 1.5, G ½, G ¾ female
■■ Cable gland non-armoured, Ex d, nickel-plated brass
■■ Cable gland non-armoured, Ex d, stainless steel (AISI 304)
■■ Cable gland armoured, Ex d, nickel-plated brass
■■ Cable gland armoured, Ex d, stainless steel (AISI 304)
For cable connections to the internal terminal block use wire
cross-sections between 0.5 ... 1.5 mm².
For the grounding cable connection to the protective conductor screws use max. 2.5 mm² for the internal screw and
max. 4 mm² for the external screw.
Dielectric strength
Safety class I (IEC 61298-2: 2008)
Mounting option
■■ Direct
■■ Wall bracket (only for remote mounting with capillary)
Option: Mounting bracket for 2" pipe mounting
Weight
Depending on switch enclosure: Aluminium alloy / AISI 316L
■■ 1.2 kg / 1.7 kg, direct mounting
■■ 1.4 kg / 1.9 kg, remote mounting with 2 m capillary
Page 3 of 6
Setting range
Setting
range
in °C
Working
range
in °C
Proof
temperature
in °C
Fixed dead band for contact version
1 contact SPDT
A, B, C
in °C
1 contact DPDT
G
in °C
SAMA class
1 contact DPDT
H
in °C
-30 ... +10
-40 ... +60
90
≤2
≤2
≤8
IIC
-15 ... +40
-40 ... +60
90
≤ 1.5
≤2
≤8
IIC
10 ... 70
-40 ... +70
90
≤ 1.5
≤2
≤8
IIC
40 ... 100
-40 ... +120
140
≤ 1.5
≤2
≤8
IIC
70 ... 120
-40 ... +170
180
≤ 1.5
≤4
≤ 16
IIA 1)
90 ... 160
-40 ... +170
180
≤2
≤4
≤ 16
IIA
130 ... 190
-40 ... +190
210
≤ 2.5
≤4
≤ 16
IIA
160 ... 250
-40 ... +280
300
≤ 2.5
≤4
≤ 16
IIA
1) Permissible ambient temperature -40 ... ≤ +70 °C. In case of ambient temperature > 70 ... ≤ 85 °C SAMA class changes to IIC. Dimensions X and Y change accordingly.
Thermowell
In principle, the operation of a mechanical temperature
switch without a thermowell is possible with low process-side
loading (low pressure, low viscosity and low flow velocities).
However, in order to enable exchanging the temperature
switch during operation (e.g. instrument replacement or
calibration) and to ensure a better protection of the instrument and also the plant and the environment, it is advisable
to use a thermowell from the extensive WIKA thermowell
portfolio.
For further information on the calculation of the thermowell,
see Technical information IN 00.15.
Options
■■ Other process connection, also with adapter
■■ Permissible ambient temperature -60 ... +85 °C 2)
■■ Helical bulb for measuring ranges: -15 ... +40 °C and
10 ... 70 °C
■■ Contact bulb, to measure surface temperatures on flat
surfaces or pipes
■■ Other insertion length for direct mounting, ≤ 1 m
■■ Offshore version 3)
■■ NACE version 3)
2) Only available for contacts without hermetic sealing
3) WIKA recommends argon gas-filled contact versions, use of adjustable dead band
allowed.
Page 4 of 6
WIKA data sheet TV 31.65 ∙ 05/2016
Approvals
Logo
Description
EU declaration of conformity
■■ Low voltage directive
Country
European Community
■■ ATEX 1) directive
I M 2 (only available with stainless steel 316L switch enclosure)
II 2 GD
IECEx 1) per IEC 60079-0, IEC 60079-1, IEC 60079-26, IEC 60079-31
Ex d I Mb (only available with stainless steel 316L switch enclosure)
IECEx member states
Ex d IIC T6/T4 2) Gb
Ex tb IIIC T85/T135 2) Db
EAC
Hazardous areas
Eurasian Economic Community
KOSHA
Hazardous areas
South Korea
INMETRO
Brazil
■■ Metrology, measurement technology
■■ Hazardous areas
1) Double marking ATEX and IECEx on the same product label.
2) The temperature class is related to the ambient temperature range. See the type examination certificate for further details.
Manufacturer‘s information and certificates
Logo
Description
SIL 2 rating (option), per IEC 61508
Functional safety
The electrical rating for DC applications is limited to
30 V / 100 mA.
Certificates (option)
■■ 2.2 test report per EN 10204
■■ 3.1 inspection certificate per EN 10204
Approvals and certificates, see website
WIKA data sheet TV 31.65 ∙ 05/2016
Page 5 of 6
Dimensions in mm
Aluminium alloy
Stainless steel
Legend



Ground screw, outside
Terminal block
Ground screw, inside
SW Spanner width




Calibration scale
A
Process connection
Access cover plate
B
Electrical connection
For dimensions A, B, K, X and Y see page 3
Permissible mounting positions
Aluminium alloy
Adjustment screw
Set point adjustment rod
Stainless steel
Ordering information
Model / Switch enclosure / Sensor version / Capillary length (if applicable) / Contact version / Setting range /
Process connection / Electrical connection / Options
Page 6 of 6
WIKA data sheet TV 31.65 ∙ 05/2016
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel.
+49 9372 132-0
Fax
+49 9372 132-406
info@wika.de
www.wika.de
05/2016 EN
© 03/2012 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.